The Western Australian mining safety regulator has released a report into a haul truck fatality at a Western Australian quarry.
The regulator confirmed “At this stage of the investigation, the following is evident: the loaded truck entered a single lane section of roadway with two narrow points. When it reached the second narrow point, the truck’s right side wheels rode up and over the windrow. As it straddled the windrow, its forward movement was initially arrested with the right side wheels over the crest edge, but the truck then slid over the edge falling 15 metres to the lower bench.”
The Regulator says it believes that the direct cause of the incident resulted from the conditions existing when the truck was exiting the pit. It says it failed to negotiate a narrowing section of roadway on the ramp.
The right wheels rode up over the crest edge windrow leading to the truck straddling the windrow before it teetered and fell over the edge.
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It lists a range of contributory causes of the haul truck fatality incident including:
- A ‘step in’ on the crest side reduced the bench width by over 20% along a 25-metre section;
- The ‘step in’ was on the driver’s offside which has restricted visibility;
- The crest (drop-off) edge windrows were located along the immediate edge of the bench;
- The size and shape of the windrow, as well as adjacent material buildup, assisted the truck’s wheels to ride up over the windrow;
- There was no demarcation or signage in the near area;
- The truck did not change the angle of approach to avoid the ‘step in’;
- The incident occurred between dawn and sunrise when the light is changing, affecting visibility.
You can read the full report on the Department’s website
The video below shows the outcome of an investigation involving a haul truck at Whitehaven’s Maules Creek mine.
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